concepts include ghosts and time travel. I have just read about a ghost and been fooled into thinking that he was a time traveler. See here. There were enough clues to Freddy's supernatural status.
There must be circumstances in which time travelers would be mistaken for ghosts, e.g., appearing and disappearing in deserted houses etc. The hero of HG Wells' "The Chronic Argonauts" moved into an empty and shunned house, time traveled within the house, was attacked as an intruder by the previous occupants, defended himself and fled into time leaving a man dead. In the absence of any evidence of an intruder, two young men were convicted of the murder of their father, which was why the house was empty and shunned.
When Wells' Time Traveler first glimpsed a wraith-like Morlock, he speculated that the latter was a ghost and further theorized that there would be more ghosts around by 802,701 AD. He had previously played some trick with a "ghost" on his dinner guests.
In Clifford Simak's The Goblin Reservation, a University Time Travel Department advertised a public lecture, "'How It Happened I Did Not Write The Plays' by William Shakespeare" while the Supernatural Department had conjured a ghost that was so old that he did not remember whose ghost he was. When Shakespeare met the ghost, the ghost remembered that he was Shakespeare.